ANTI-LOCK BRAKE SYSTEM DIAGNOSIS SYSTEM
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DESCRIPTION
When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the intelligent tester to the vehicle and reading various data output from the skid control ECU.
The skid control ECU stores DTCs when the ECU detects a malfunction in the ECU itself or in its circuits.
To check the DTCs, connect the intelligent tester to the DLC3 on the vehicle. The intelligent tester enables you to clear the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List.
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Check the battery voltage.
If the voltage is below 11 V, recharge the battery before proceeding to the next step.
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DIAGNOSIS
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Text in Illustration *1 ABS Warning Light *2 Brake Warning Light If the skid control ECU detects a malfunction, the ABS warning light and brake warning light will come on in order to warn the driver.
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WARNING LIGHT INITIAL CHECK
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Release the parking brake.
CAUTION:
When releasing the parking brake, set chocks to hold the vehicle for safety.
Tech Tips
When the brake fluid level is low, the brake warning light comes on.
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When the ignition switch is turned to ON, check that the ABS warning light and brake warning light come on for approximately 3 seconds.
If the warning light check result is not normal, proceed to troubleshooting for the ABS warning light and brake warning light circuits listed below.
Trouble Area See procedure ABS warning light circuit (Remains on) ABS warning light circuit (Does not come on) Brake warning light circuit (Remains on) Brake warning light circuit (Does not come on)
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